[AMDGPU] Fix unittest linking error with LLVM_LINK_LLVM_DYLIB (#91727)

Follow-up to #88257

Author: hahnjo

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.h

@@ -18,6 +18,7 @@
 #include "llvm/BinaryFormat/MsgPackDocument.h"
 #include "llvm/Support/AMDGPUMetadata.h"
 #include "llvm/Support/Alignment.h"
+#include "llvm/Support/Compiler.h"
 
 namespace llvm {
 
@@ -61,7 +62,8 @@ class MetadataStreamer {
                                msgpack::MapDocNode Kern) = 0;
 };
 
-class MetadataStreamerMsgPackV4 : public MetadataStreamer {
+class LLVM_EXTERNAL_VISIBILITY MetadataStreamerMsgPackV4
+    : public MetadataStreamer {
 protected:
   std::unique_ptr<msgpack::Document> HSAMetadataDoc =
       std::make_unique<msgpack::Document>();

llvm/lib/Target/AMDGPU/SIProgramInfo.h

@@ -17,6 +17,7 @@
 #define LLVM_LIB_TARGET_AMDGPU_SIPROGRAMINFO_H
 
 #include "llvm/IR/CallingConv.h"
+#include "llvm/Support/Compiler.h"
 #include <cstdint>
 
 namespace llvm {
@@ -27,7 +28,7 @@ class MCExpr;
 class MachineFunction;
 
 /// Track resource usage for kernels / entry functions.
-struct SIProgramInfo {
+struct LLVM_EXTERNAL_VISIBILITY SIProgramInfo {
     // Fields set in PGM_RSRC1 pm4 packet.
     const MCExpr *VGPRBlocks = nullptr;
     const MCExpr *SGPRBlocks = nullptr;

llvm/unittests/MC/AMDGPU/SIProgramInfoMCExprs.cpp

@@ -7,9 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "AMDGPUHSAMetadataStreamer.h"
-#include "AMDGPUTargetMachine.h"
-#include "GCNSubtarget.h"
 #include "SIProgramInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
@@ -25,9 +24,8 @@ using namespace llvm;
 
 class SIProgramInfoMCExprsTest : public testing::Test {
 protected:
-  std::unique_ptr<GCNTargetMachine> TM;
+  std::unique_ptr<LLVMTargetMachine> TM;
   std::unique_ptr<LLVMContext> Ctx;
-  std::unique_ptr<GCNSubtarget> ST;
   std::unique_ptr<MachineModuleInfo> MMI;
   std::unique_ptr<MachineFunction> MF;
   std::unique_ptr<Module> M;
@@ -49,7 +47,7 @@ class SIProgramInfoMCExprsTest : public testing::Test {
     const Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
     TargetOptions Options;
 
-    TM.reset(static_cast<GCNTargetMachine *>(TheTarget->createTargetMachine(
+    TM.reset(static_cast<LLVMTargetMachine *>(TheTarget->createTargetMachine(
         Triple, CPU, FS, Options, std::nullopt, std::nullopt)));
 
     Ctx = std::make_unique<LLVMContext>();
@@ -59,9 +57,7 @@ class SIProgramInfoMCExprsTest : public testing::Test {
     auto *F = Function::Create(FType, GlobalValue::ExternalLinkage, "Test", *M);
     MMI = std::make_unique<MachineModuleInfo>(TM.get());
 
-    ST = std::make_unique<GCNSubtarget>(TM->getTargetTriple(),
-                                        TM->getTargetCPU(),
-                                        TM->getTargetFeatureString(), *TM);
+    auto *ST = TM->getSubtargetImpl(*F);
 
     MF = std::make_unique<MachineFunction>(*F, *TM, *ST, 1, *MMI);
     MF->initTargetMachineFunctionInfo(*ST);